diff -r f44187605315 -r 6f26417b71bb mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Sep 12 15:07:27 2018 -0700
+++ b/mercurial/localrepo.py	Wed Sep 12 15:17:47 2018 -0700
@@ -818,8 +818,8 @@
         return caps
 
     def _applyopenerreqs(self):
-        self.svfs.options = dict((r, 1) for r in self.requirements
-                                           if r in self.openerreqs)
+        self.svfs.options = {r: True for r in self.requirements
+                             if r in self.openerreqs}
         # experimental config: format.chunkcachesize
         chunkcachesize = self.ui.configint('format', 'chunkcachesize')
         if chunkcachesize is not None: